Set shoe for well casings



March 26, 1935.

c. E. BURT SET SHOE FOR WELL CASINGS Filed Dec. 10, 1934 I INVENTOR.alwwca g. M

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Patented Mar. 26, 1935 UNITED STATES PATENT OFFICE SET SHOE FOR WELLOASINGS Clarence E. Burt, Los to Baker Oil Tools,

Angeles, Calif., assignor Inc., Huntington Park,

Calif., a corporation of California Application December 10, 1934,Serial No. 756,855

3Claimsinvention relates to devices commonly.

from heaving up into the lower end of such pipe.-

It is the principal object of my present invention to provide animproved and simplified device for the purposes above described, whichdevice constitutes an improvement over devices previously used for thispurpose, such as set out in Technical Paper 247, issued by the Bureau ofMines in 1920, entitled Perforated Casing and Screen Pipe in Oil Wells,and particular reference to pages 33-39 thereof. One form which theinvention may assume is exemplified in the following description andillustrated by way of example in the accompanving drawing, in which:

Fig. 1 is a central vertical section through the lowerendofanoilstringofcasingshowingmy improved device fitted thereto, the same being partlyin section.

Fig. 2 is a transverse sectional view taken on 30 line l'IlI of Fig. 1.t

Fig. 3 is a bottom view of the device.

more particularly to the accompe nying drawing, 10 indicates the lowerendof a sec- 35 tionofperforatedcasingwhichisusually setin a well-borein t with the oil sands for thepui'poseofenablingtheoiltoenterthe casingbut excluding the sand. Fitted to the lower ex--lremityofthissectionofcasing10iswhatis termed a shoe or coupling 11which is a tubular steel member. The shoe or coupling 11 is interiorlythreaded in its lower 'end as at 12. Threadedinto this threaded section12 is a hollow plug munber 14 preferably made of cast iron or othersuitable material. This hollow plug member is formed with a hollowcylindrical section 15 exteriorly threaded that it may be threaded intothe threaded section 12 of the shoe or coupling 11.

upwardly from this threaded section 15 and formed integral therewith isa hollow tubular extension 16 whom maximum exterior diameter is les thanthe interior diameter of the casing 10. This extension 16 is hollowand'open ended, as illustrated, and its upper end is formed with aninterior wash pipe seat 17. This seatis frusto-conical with its smallerdiameter lowermost.

Intermediate its ends, the interior of the extension 16 is formed with avalve seat 18 with which a poppet type valve 19 cooperates. This 5 valve19 is fitted with a valve stem 20 reciprocably mounted in a guide 21carried by a web k 22 formed integral with the body 14 at the junctionbetween the threaded section 15 and the tubular hollow extension 16. Aspring 23 is pro- 10 vided which normally the upwardly seating valve 19seated.

At the lower end of the threaded section 15 of the body 14 is aninverted dome-shaped portion 24 which islikewise hollow. The exteriordi- 15 ameter of this dome-shaped member 24 agrees with the exteriordiameter of the coupling or shoe 11 so that an annular shoulder 25 willbe formed to abut against the lower end of the shoe 11 when the body 14is fitted thereto.

The inverted dome-shaped portion 24 of the body'is provided with aseries of radial ports 26 which extend slightly upwardly and laterallyin order that when fluid is expelled therefrom under high pressure, thefluid will assume a whirling 25 action which adds to its washingefliciency.

The dome-shaped member at its center is formed with a threaded port 2'7in which a plug 28 is threaded. By removing this plug before loweringthe device into the hole, a stream of 30 fluid may be directeddownwardly instead of merely laterally or radially through the ports 26as is the case when the plug'28 is in place.

In operation of the device, it is constructed and substantially asillustrated. When the casing is lowered into the hole, a wash pipe shownin dotted lines at 30 is placed in the casing, which wash pipe has anabutment member 31 tapered to correspond with the wash pipe seat' 17 sothat fluid under high pressure directed downwardly through the wash pipe30 will pass into the tubular extension 16, unseat the valve 19 anddischarge throughthe ports 26. The formatlon of these ports, asdescribed, is such as to give water or fluid a swirling action. Thisfluid washes the mudout of the well, as previously described; After thewashing action has been accomplished, the wash pipe 30 is removed andthe valve 19 seats so as to prevent sand from heaving up through thecoupling 11 and the body 14 into the perforated pipe.

From the foregoing it is obvious that I have provided assembled on thelower end of perforated pipe i a very simple and inexpensive device foruse m connection with setting Perforatedinvention, itis to be understoodthat various changes may be made in its construction by those skilled inthe art without departing from the spirit of the invention as defined inthe appended claims.

Having. thus described my invention, what I claim and desire to secureby Letters Patent 1. A device of the character described comprising atubular coupling for connection to the lower end of a string ofperforated casing, a hollow body member having a threaded hollowcylindrical portion to be threaded into the lower end of said coupling,said body having a hollow cylindrical extension formed integral withsaid threaded section and extending upwardly therefrom coaxiallythereof, said extension being of an exterior diameter less than theinterior diameter of the casing to which said coupling is fitted, saidextension being open ended and being formed with a tapered wash pipeseatat its upper end, a valve seat formed about the interior perimeter ofsaid extension intermediate the ends thereof, a. spring-pressed upwardlyseating valve cooperating with said seat, an inverted dome-shapedportion at the lower end of said threaded section and of an exteriordiameter agreeing with the exterior diameter of the coupling to providean annular shoulder abutting against the lower extremity of thecoupling, said hollow dome-shaped portion being formed with portsthrough the wall thereof to enable fluid to be pumped downwardly throughthe body and outwardly into the bore around said coupling.

2. A device of the character described comprising a tubular coupling forconnection to the lower' end of a string of perforated casing, a hollowbody member having a threaded hollow cy-.

lindrical portion to be threaded into the lower end of said coupling,said body having a hollow cylindrical extension formed integral withsaid threaded section and extending upwardly there'- from coaxiallythereof, said extension being of an exterior diameter lessthan theinterior diameter of the casing to which said coupling is fitted, saidextension being open ended and being formed with a tapered wash pipeseat at its upper end, a valve seat formed about the interior perimeterof said extension intermediate the ends thereof, a spring-pressediupwardiy seating valve cooperating with said seat, an inameter agreeingwith the exterior diameter of the coupling to provide an annularshoulder abutting against the lower extremity of the coupling, saidhollow dome-shaped portion being formed with ports through the wallthereof to enable fluid to be pumped downwardly through the body andoutwardly into the bore around said coupling, saidports being upwardlyand laterally directed to give the discharged fluid a whirling action.

3. A device of the character described comprising a tubular coupling forconnection to the lower end of a string of perforated casing, a hollowbody member having a threaded hollow cylindrical portion to be threadedinto the lower end of said coupling, said body having a hollowcylindrical extension formed integral with said threaded section andextending upwardly therefrom coaxlally'thereof, said extension being ofan exterior diameter less than the interior diverted dome-shaped portionat the lower end of said threaded section and of an exterior di-. v10

ameter of the casing to which said coupling abutting against the lowerextremity of the coupling, said hollow dome-shaped portion being formedwith ports through the wall thereof to enable fluid to be pumpeddownwardly through the body and outwardly into thebore around saidcoupling, said dome-shaped memher being formed with a central port and are movable plug fltting said port.

CLARENCE E. BURT.

